BARTINGTON INSTRUMENTS
Page 12 of 19 OM2441/1
Table 2. Magnetometer output types.
7. Using the SCU1
7.1. Output Scaling
7.1.1. Converting Output Voltage to Magnetic Units
The conditioned output voltage at the output connectors is displayed on the panel meters
and can be converted into magnetic field strength units (e.g. Tesla). The conversion will
depend on the range of your magnetometer, analogue output voltage, and scale factor of your
magnetometer.
Scale factor = range / analogue output of magnetometer. For example:
•
a magnetometer with a range of 250μT and an analogue output of ±10V has a scale factor of
25
•
a magnetometer with a range of 60μT and an analogue output of ±3V has a scale factor of 20.
To convert voltage to field strength:
1. Divide the output voltage by the gain control setting, then
2. Multiply by the scale factor for your magnetometer.
For example, if the display for the X axis shows 6.5V when connected to a magnetometer with a
range of 250μT and an analogue output of ±10V, with SCU1 gain = 50, this indicates an X axis field
of:
(6.5/50) x (250/10) = 3.25µT
7.2. Over-range Condition
The SCU1 conditioned output and display meter readings are only accurate when in the range
-10V to +10V. Readings beyond -10 to +10V are considered over-range as they will not be to the
specification accuracy.
Note:
Use the offset and gain controls, as described in
, to ensure
the conditioned outputs do not go over-range.
